Nitrous Express Lightning 500 Bottle Valve (Fits 12lb Bottles)Why did we call this valve the Lightning 500? Because it has . 500 orifice and . 500 piston lift! The largest orifice in the highest piston lift of any conventional bottle valve on the planet. The 500 has a . 625 siphon tube, only one 45 degree turn in the nitrous flow path and fittings that will allow the use of up to a 10AN supply line with no restrictions. The 500 is engineered to eliminate all obstructions, short edges or tight turns that will